Direct Synthesis of 3-Acylindoles through Rhodium(III)-Catalyzed Annulation of<i>N</i>-Phenylamidines with α-Cl Ketones
作者:Jianhui Zhou、Jian Li、Yazhou Li、Chenglin Wu、Guoxue He、Qiaolan Yang、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.8b03383
日期:2018.12.7
versatile 3-acylindoles through Rh(III)-catalyzed C–H activation and annulation cascade of N-phenylamidines with α-Cl ketones was developed, in which α-Cl ketones serve as unusual one-carbon (sp3) synthons. This strategy features high regioselectivity, efficiency, wide substrate tolerance, and mild reaction conditions, which further underscore its synthetic utility in drug molecule synthesis.
Rh(III)-Catalyzed Synthesis of <i>N</i>-Unprotected Indoles from Imidamides and Diazo Ketoesters via C–H Activation and C–C/C–N Bond Cleavage
作者:Zisong Qi、Songjie Yu、Xingwei Li
DOI:10.1021/acs.orglett.5b03669
日期:2016.2.19
The synthesis of N-unprotected indoles has been realized via Rh(III)-catalyzed C–Hactivation/annulation of imidamides with α-diazo β-ketoesters. The reaction occurs with the release of an amide coproduct, which originates from both the imidamide and the diazo as a result of C═N cleavage of the imidamide and C–C(acyl) cleavage of the diazo. A rhodacyclic intermediate has been isolated and a plausible
Ruthenium(II)‐Catalyzed C−H Activation of Imidamides and Divergent Couplings with Diazo Compounds: Substrate‐Controlled Synthesis of Indoles and 3
<i>H</i>
‐Indoles
作者:Yunyun Li、Zisong Qi、He Wang、Xifa Yang、Xingwei Li
DOI:10.1002/anie.201606316
日期:2016.9.19
Indoles are an important structural motif that is commonly found in biologically active molecules. In this work, conditions for divergentcouplings between imidamides and acceptor–acceptor diazo compounds were developed that afforded NH indoles and 3H‐indoles under ruthenium catalysis. The coupling of α‐diazoketoesters afforded NH indoles by cleavage of the C(N2)−C(acyl) bond whereas α‐diazomalonates
N-Heterocyclic carbene-catalyzed annulation of ynals with amidines: access to 1,2,6-trisubstituted pyrimidin-4-ones
作者:Yangxi Xie、Jian Wang
DOI:10.1039/c8cc02023j
日期:——
A thiazolium-catalyzed annulation of ynals and amidines has been reported to construct pyrimidin-4-ones.
一种噻唑嗪催化的ynals和胺亚胺的环化反应已被报道用于构建嘧啶-4-酮。
Synthesis of 1,3-Benzodiazepines through [5 + 2] Annulation of <i>N</i>-Aryl Amidines with Propargylic Esters
作者:Xia Song、Qianting Zhou、Jie Zhao、Yuqin Jiang、Xiaopeng Zhang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.0c03515
日期:2020.12.18
In this paper, an efficient synthesis of functionalized 1,3-benzodiazepines through an unprecedented [5 + 2] annulation of N-aryl amidines with propargylic esters is presented. The reactions proceed through Rh(III)-catalyzed C(sp2)−H alkenylation followed by annulation and deacetoxylation along with cascade C−H/N−H/C−O bond cleavage and C−C/C−N bond formation. Furthermore, the cytotoxicity of selected